Revert "[wasm-simd][liftoff][arm][arm64] Implement integer narrowing"

This reverts commit 387d85ad.

Reason for revert: Broke ARM tree https://ci.chromium.org/p/v8/builders/ci/V8%20Arm%20-%20debug/13926?

Original change's description:
> [wasm-simd][liftoff][arm][arm64] Implement integer narrowing
> 
> Bug: v8:9909
> Change-Id: I0664df45fe399bfa018ff8bcacdbdae66944ed29
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2154834
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67254}

TBR=clemensb@chromium.org,zhin@chromium.org

Change-Id: I6e5cac9cf9e6070b4819edbde6cd2ada2d0b476a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9909
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158010Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67256}

src/wasm/baseline/arm/liftoff-assembler-arm.h

@@ -223,18 +223,6 @@ inline Register EnsureNoAlias(Assembler* assm, Register reg,
   return tmp;
 }
 
-inline void S128NarrowOp(LiftoffAssembler* assm, NeonDataType dt,
-                         LiftoffRegister dst, LiftoffRegister lhs,
-                         LiftoffRegister rhs) {
-  if (dst == lhs) {
-    assm->vqmovn(dt, dt, dst.low_fp(), liftoff::GetSimd128Register(lhs));
-    assm->vqmovn(dt, dt, dst.high_fp(), liftoff::GetSimd128Register(rhs));
-  } else {
-    assm->vqmovn(dt, dt, dst.high_fp(), liftoff::GetSimd128Register(rhs));
-    assm->vqmovn(dt, dt, dst.low_fp(), liftoff::GetSimd128Register(lhs));
-  }
-}
-
 }  // namespace liftoff
 
 int LiftoffAssembler::PrepareStackFrame() {
@@ -2236,25 +2224,25 @@ void LiftoffAssembler::emit_s128_xor(LiftoffRegister dst, LiftoffRegister lhs,
 void LiftoffAssembler::emit_i8x16_sconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  liftoff::S128NarrowOp(this, NeonS8, dst, lhs, rhs);
+  bailout(kSimd, "i8x16_sconvert_i16x8");
 }
 
 void LiftoffAssembler::emit_i8x16_uconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  liftoff::S128NarrowOp(this, NeonU8, dst, lhs, rhs);
+  bailout(kSimd, "i8x16_uconvert_i16x8");
 }
 
 void LiftoffAssembler::emit_i16x8_sconvert_i32x4(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  liftoff::S128NarrowOp(this, NeonS16, dst, lhs, rhs);
+  bailout(kSimd, "i16x8_sconvert_i32x4");
 }
 
 void LiftoffAssembler::emit_i16x8_uconvert_i32x4(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  liftoff::S128NarrowOp(this, NeonU16, dst, lhs, rhs);
+  bailout(kSimd, "i16x8_uconvert_i32x4");
 }
 
 void LiftoffAssembler::emit_i16x8_sconvert_i8x16_low(LiftoffRegister dst,

src/wasm/baseline/arm64/liftoff-assembler-arm64.h

@@ -1556,57 +1556,25 @@ void LiftoffAssembler::emit_s128_xor(LiftoffRegister dst, LiftoffRegister lhs,
 void LiftoffAssembler::emit_i8x16_sconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  UseScratchRegisterScope temps(this);
-  VRegister tmp = temps.AcquireV(kFormat8H);
-  VRegister right = rhs.fp().V8H();
-  if (dst == rhs) {
-    Mov(tmp, right);
-    right = tmp;
-  }
-  Sqxtn(dst.fp().V8B(), lhs.fp().V8H());
-  Sqxtn2(dst.fp().V16B(), right);
+  bailout(kSimd, "i8x16_sconvert_i16x8");
 }
 
 void LiftoffAssembler::emit_i8x16_uconvert_i16x8(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  UseScratchRegisterScope temps(this);
-  VRegister tmp = temps.AcquireV(kFormat8H);
-  VRegister right = rhs.fp().V8H();
-  if (dst == rhs) {
-    Mov(tmp, right);
-    right = tmp;
-  }
-  Sqxtun(dst.fp().V8B(), lhs.fp().V8H());
-  Sqxtun2(dst.fp().V16B(), right);
+  bailout(kSimd, "i8x16_uconvert_i16x8");
 }
 
 void LiftoffAssembler::emit_i16x8_sconvert_i32x4(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  UseScratchRegisterScope temps(this);
-  VRegister tmp = temps.AcquireV(kFormat4S);
-  VRegister right = rhs.fp().V4S();
-  if (dst == rhs) {
-    Mov(tmp, right);
-    right = tmp;
-  }
-  Sqxtn(dst.fp().V4H(), lhs.fp().V4S());
-  Sqxtn2(dst.fp().V8H(), right);
+  bailout(kSimd, "i16x8_sconvert_i32x4");
 }
 
 void LiftoffAssembler::emit_i16x8_uconvert_i32x4(LiftoffRegister dst,
                                                  LiftoffRegister lhs,
                                                  LiftoffRegister rhs) {
-  UseScratchRegisterScope temps(this);
-  VRegister tmp = temps.AcquireV(kFormat4S);
-  VRegister right = rhs.fp().V4S();
-  if (dst == rhs) {
-    Mov(tmp, right);
-    right = tmp;
-  }
-  Sqxtun(dst.fp().V4H(), lhs.fp().V4S());
-  Sqxtun2(dst.fp().V8H(), right);
+  bailout(kSimd, "i16x8_uconvert_i32x4");
 }
 
 void LiftoffAssembler::emit_i16x8_sconvert_i8x16_low(LiftoffRegister dst,